OPERATING INSTRUCTIONS
Page 22 Giga-Trailer
- The coupling ball is to be attached at the same height and at right angles to the towing mechanism.
Misalignment of levels can result in different steering angles.
- After the steering rod has been fitted, swing round the tractor steering to its limit until the tractor wheels touch
the collision guard (3). The swing limit (4) must not restrict the axle. At the maximum steering angle, the
cylinders should still have at least another 10 mm way remaining. If this is not the case, the collision guards
will have to be adjusted by the customer.
Check all free space and possible steering angles for collision.
After fitting is completed, open the stopcocks 1-3 fig. 9 under the vehicle completely for track-adjustment of
steering. Pump up the steering system to 60 bar with the pump (7) which is mounted on the vehicle.
After driving 20 metres straight ahead, close the cocks. The system is now ready for operation.
Check the pressure in the system regularly. If there is any deviation, repeat the above procedure.
Use the bolt (5) to secure the steering rod before manoeuvring the machine.
The towing mechanism shown here is only one example of the many types of hitch to be found on tractors so
that in everyday practice a different method of mounting the towing device can be used to suit the situation.
However to ensure correct functioning of the steering, the main points given in the above description should be
taken into consideration.
Bleeding the Forced Steering
1. Check the oil level in the pump container and refill as needed (Hydr.-oil VG 46)
2. Two persons are required to bleed the forced steering.
3. Uncouple the steering rod from the tractor. Do not lock.
4. Screw out all the sealing plugs on all the hydraulic cylinders. Two master cylinders on the drawbar and
two steering cylinders on the steering axle.
5. Open ball cock no. 1
6. Pump oil into the system with the pump until bubble-free oil emerges from the openings on the piston
crown side of the cylinder mounted on the left in direction of travel on the steering axle and the right-
hand cylinder on the drawbar.
7. Screw in the sealing plugs again on the piston crown side of the cylinders and open ball cock no. 1.
ATTENTION: Continue to pump while the screws are being closed.
8. Open ball cock no. 2
9. Pump oil into the system with the pump until bubble-free oil emerges from the openings on the piston
crown side of the cylinder mounted on the right in direction of travel on the steering axle and the left-
hand cylinder on the drawbar.
10. Screw in the sealing plugs again on the piston crown side of the cylinder and then close ball cock no. 2.
ATTENTION: Continue to pump while the screws are being closed.
11. Open ball cock no. 3.
12. Pump oil into the system with the pump until bubble-free oil emerges from the openings on the connecting
rod side of all four mounted cylinders.
13. Screw in sealing plugs again on the connecting rod side of the cylinders and then close ball cock no. 3.
ATTENTION: Continue to pump while the screws are being closed.
14. Raise the steering axle until the wheels no longer touch the ground.
15. Bring the steering cylinder to the same level and drop the axle again.
16. Check that the master cylinders have been run out to the same degree. If this is not the case, continue
with step no. 17.
17. To adjust the master cylinders, open the ball cock which releases the oil supply to the piston side of the
shorter master cylinder and open the sealing plug on the steering cylinder on the piston crown side (do
not completely unscrew) which is connected to the piston crown of the second master cylinder.
18. Pump slowly until both master cylinders reach the same length. Close ball cock and sealing plugs again.
19. Open all the ball cocks, preload system to 60 bar and close the ball cocks again.
